Conductive heat extraction to a deep borehole: Thermal analyses and dimensioning rules

Claesson, Johan; Eskilson, Per

doi:10.1016/0360-5442(88)90005-9

Cited by 98 publications

(49 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The latter fall within tr < t < tz, termed medium times to distinguish them from very long time values t > tz corresponding to the approach to the steady-state (Claesson and Eskilson, 1988). In this case, the integral average temperature change at the radial distance r from the borehole center is given by (Bandos et al, 2009) Eq.…”

Section: Line-source Theorymentioning

confidence: 99%

“…In the quasi steady-state case, the heat transport by the fluid in the tube, accompanied by the transverse heat flux to the air, is governed by the convection equations (Claesson and Eskilson, 1988;Hellström, 1991):…”

Section: 2mentioning

confidence: 99%

“…The cylinder heat source (Ingersoll et al, 1954) and line heat source (Carslaw and Jaeger, 1959) model for BHE with parameter-estimating techniques are commonly applied in Europe (Claesson and Eskilson, 1988;Gehlin and Hellström, 2003;Sanner et al, 2005;Witte et al, 2002) and North America (Austin, 1998;Beier and Smith, 2002;Beier, 2008;Shonder and Beck, 2000). Kelvin's ILS model is among the most widely used models for evaluation of response test data at sufficiently large times because of the fact that the TRT was actually devised on the basis of ILS theory (Ingersoll et al, 1954;Mogensen, 1983).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improving parameter estimates obtained from thermal response tests: Effect of ambient air temperature variations

et al. 2011

View full text Add to dashboard Cite

This paper presents a method of subtracting the effect of atmospheric conditions from thermal response test (TRT) estimates by using data on the ambient air temperature. The method assesses effective ground thermal conductivity within 10% of the mean value from the test, depending on the time interval chosen for the analysis, whereas the estimated value can vary by a third if energy losses outside the borehole are neglected. Evaluating the same test data using the finite line-source (FLS) model gives lower values for the ground thermal conductivity than for the infinite line-source (ILS) model, whether or not heat dissipation to ambient air is assumed.

show abstract

Section: Line-source Theorymentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improving parameter estimates obtained from thermal response tests: Effect of ambient air temperature variations

et al. 2011

View full text Add to dashboard Cite

show abstract

“…This was not directly integrated into the model. The calculations are based on the work of Claesson and Eskilson in Sweden [21] using the Earth Energy Storage (EED) software. The loadings for the 10 × 10 m surfaces of the cubic building were compared with EED to check for adequate U-tube borehole length and verify the assumed temperature input coming out of the ground heat exchanger system.…”

Section: Wall and Ground Heat Pressure Lossesmentioning

confidence: 99%

An Innovative Use of Renewable Ground Heat for Insulation in Low Exergy Building Systems

Meggers¹,

Baldini

Leibundgut

2012

Energies

View full text Add to dashboard Cite

Ground heat is a renewable resource that is readily available for buildings in cool climates, but its relatively low temperature requires the use of a heat pump to extract it for heating. We developed a system that uses low temperature ground heat directly in a building wall to reduce transmission heat losses. The Active Low Exergy Geothermal Insulation Systems (ALEGIS) minimizes exergy demand and maximizes the use of renewable geothermal heat from the ground. A fluid is pumped into a small pipe network in an external layer of a wall construction that is linked to a ground heat source. This decouples the building from the outside temperature, therefore eliminating large peak demands and reducing the primary energy demand. Our steady-state analysis shows that at a design temperature of −10 °C the 6 cm thick active insulation system has equivalent performance to 11 cm of passive insulation. Our comparison of heating performance of a building with our active insulation system versus a building with static insulation of the same thickness shows a 15% reduction in annual electricity demand, and thus exergy input. We present an overview of the operation and analysis of our low exergy concept and its modeled performance.

show abstract

“…This paper utilises a geothermal borehole heat exchanger design tool called Energy Earth Designer (EED), the closed form radial heat flow equation developed by Claesson andEskilson (Eskilson, 1987, Claesson andEskilson, 1988) and finite element method analysis developed using TEMP/W in order to investigate the temperature predictions with respect to time and distance resulting from analysis using the various methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Finite Element Analysis of Heat Transfer in a Closed Loop Geothermal System

Hemmingway

Tolooiyan

2013

International Journal of Green Energy

View full text Add to dashboard Cite

Analysis of the thermal regime created by a geothermal borehole heat exchanger is performed using a closed form radial heat flow equation, a geothermal borehole heat exchanger design tool and a finite element model. Climatic, heat exchanger construction and building load data are entered into the heat exchanger design tool in order to create a theoretical model along with thermal parameters from a number of geological formations.Output data from the design tool model are used in conjunction with the closed form radial heat flow equation to calculate the predicted temperature with respect to time and distance from the heat exchanger for the modelled ground formations. The output data from the design tool is also used to create a number of finite element method models against which the predictions calculated using the closed form radial heat flow equation can be Greek letters:

show abstract

Conductive heat extraction to a deep borehole: Thermal analyses and dimensioning rules

Cited by 98 publications

References 2 publications

Improving parameter estimates obtained from thermal response tests: Effect of ambient air temperature variations

Improving parameter estimates obtained from thermal response tests: Effect of ambient air temperature variations

An Innovative Use of Renewable Ground Heat for Insulation in Low Exergy Building Systems

Numerical and Finite Element Analysis of Heat Transfer in a Closed Loop Geothermal System

Contact Info

Product

Resources

About